MIPS: Use the HandlerFrontendHeader in most call compilers.

src/mips/stub-cache-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 728 matching lines @@
                                  ExtraICState extra_ic_state) {
   // ----------- S t a t e -------------
   //  -- a0: receiver
   //  -- a1: function to call
   // -----------------------------------
   // Check that the function really is a function.
   __ JumpIfSmi(a1, miss);
   __ GetObjectType(a1, a3, a3);
   __ Branch(miss, ne, a3, Operand(JS_FUNCTION_TYPE));
 
-  // Patch the receiver on the stack with the global proxy if
-  // necessary.
   if (object->IsGlobalObject()) {
+    const int argc = arguments.immediate();
+    const int receiver_offset = argc * kPointerSize;
     __ lw(a3, FieldMemOperand(a0, GlobalObject::kGlobalReceiverOffset));
-    __ sw(a3, MemOperand(sp, arguments.immediate() * kPointerSize));
+    __ sw(a3, MemOperand(sp, receiver_offset));
   }
 
   // Invoke the function.
   CallKind call_kind = CallICBase::Contextual::decode(extra_ic_state)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   __ InvokeFunction(a1, arguments, JUMP_FUNCTION, NullCallWrapper(), call_kind);
 }
 
 
@@ skipping 756 matching lines @@
 }
 
 
 void CallStubCompiler::GenerateNameCheck(Handle<Name> name, Label* miss) {
   if (kind_ == Code::KEYED_CALL_IC) {
     __ Branch(miss, ne, a2, Operand(name));
   }
 }
 
 
-void CallStubCompiler::GenerateGlobalReceiverCheck(Handle<JSObject> object,
-                                                   Handle<JSObject> holder,
-                                                   Handle<Name> name,
-                                                   Label* miss) {
-  ASSERT(holder->IsGlobalObject());
-
-  // Get the number of arguments.
-  const int argc = arguments().immediate();
-
-  // Get the receiver from the stack.
-  __ lw(a0, MemOperand(sp, argc * kPointerSize));
-
-  // Check that the maps haven't changed.
-  __ JumpIfSmi(a0, miss);
-  CheckPrototypes(
-      IC::CurrentTypeOf(object, isolate()), a0, holder, a3, a1, t0, name, miss);
-}
-
-
 void CallStubCompiler::GenerateLoadFunctionFromCell(
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Label* miss) {
   // Get the value from the cell.
   __ li(a3, Operand(cell));
   __ lw(a1, FieldMemOperand(a3, Cell::kValueOffset));
 
   // Check that the cell contains the same function.
   if (heap()->InNewSpace(*function)) {
@@ skipping 22 matching lines @@
                                                kind_,
                                                extra_state_);
   __ Jump(code, RelocInfo::CODE_TARGET);
 }
 
 
 Handle<Code> CallStubCompiler::CompileCallField(Handle<JSObject> object,
                                                 Handle<JSObject> holder,
                                                 PropertyIndex index,
                                                 Handle<Name> name) {
-  // ----------- S t a t e -------------
-  //  -- a2    : name
-  //  -- ra    : return address
-  // -----------------------------------
   Label miss;
 
-  GenerateNameCheck(name, &miss);
-
-  const int argc = arguments().immediate();
-
-  // Get the receiver of the function from the stack into a0.
-  __ lw(a0, MemOperand(sp, argc * kPointerSize));
-  // Check that the receiver isn't a smi.
-  __ JumpIfSmi(a0, &miss, t0);
-
-  // Do the right check and compute the holder register.
-  Register reg = CheckPrototypes(
-      IC::CurrentTypeOf(object, isolate()),
-      a0, holder, a1, a3, t0, name, &miss);
+  Register reg = HandlerFrontendHeader(
+      object, holder, name, RECEIVER_MAP_CHECK, &miss);
   GenerateFastPropertyLoad(masm(), a1, reg, index.is_inobject(holder),
                            index.translate(holder), Representation::Tagged());
 
   GenerateCallFunction(masm(), object, arguments(), &miss, extra_state_);
 
-  // Handle call cache miss.
-  __ bind(&miss);
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(Code::FAST, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileArrayCodeCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
   Label miss;
 
-  // Check that function is still array.
-  const int argc = arguments().immediate();
-  GenerateNameCheck(name, &miss);
-  Register receiver = a1;
-
-  if (cell.is_null()) {
-    __ lw(receiver, MemOperand(sp, argc * kPointerSize));
-
-    // Check that the receiver isn't a smi.
-    __ JumpIfSmi(receiver, &miss);
-
-    // Check that the maps haven't changed.
-    CheckPrototypes(
-        IC::CurrentTypeOf(object, isolate()), receiver, holder,
-        a3, a0, t0, name, &miss);
-  } else {
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+  if (!cell.is_null()) {
     ASSERT(cell->value() == *function);
-    GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
-                                &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   Handle<AllocationSite> site = isolate()->factory()->NewAllocationSite();
   site->SetElementsKind(GetInitialFastElementsKind());
   Handle<Cell> site_feedback_cell = isolate()->factory()->NewCell(site);
+  const int argc = arguments().immediate();
   __ li(a0, Operand(argc));
   __ li(a2, Operand(site_feedback_cell));
   __ li(a1, Operand(function));
 
   ArrayConstructorStub stub(isolate());
   __ TailCallStub(&stub);
 
-  __ bind(&miss);
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileArrayPushCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2    : name
-  //  -- ra    : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
   // If object is not an array or is observed, bail out to regular call.
   if (!object->IsJSArray() ||
       !cell.is_null() ||
       Handle<JSArray>::cast(object)->map()->is_observed()) {
     return Handle<Code>::null();
   }
 
   Label miss;
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+  Register receiver = a0;
+  Register scratch = a1;
 
-  GenerateNameCheck(name, &miss);
-
-  Register receiver = a1;
-
-  // Get the receiver from the stack.
   const int argc = arguments().immediate();
-  __ lw(receiver, MemOperand(sp, argc * kPointerSize));
-
-  // Check that the receiver isn't a smi.
-  __ JumpIfSmi(receiver, &miss);
-
-  // Check that the maps haven't changed.
-  CheckPrototypes(
-      IC::CurrentTypeOf(object, isolate()), receiver, holder,
-      a3, v0, t0, name, &miss);
 
   if (argc == 0) {
     // Nothing to do, just return the length.
     __ lw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
     __ DropAndRet(argc + 1);
   } else {
     Label call_builtin;
     if (argc == 1) {  // Otherwise fall through to call the builtin.
       Label attempt_to_grow_elements, with_write_barrier, check_double;
 
       Register elements = t2;
       Register end_elements = t1;
       // Get the elements array of the object.
       __ lw(elements, FieldMemOperand(receiver, JSArray::kElementsOffset));
 
       // Check that the elements are in fast mode and writable.
       __ CheckMap(elements,
-                  v0,
+                  scratch,
                   Heap::kFixedArrayMapRootIndex,
                   &check_double,
                   DONT_DO_SMI_CHECK);
 
-      // Get the array's length into v0 and calculate new length.
-      __ lw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      // Get the array's length into scratch and calculate new length.
+      __ lw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
       STATIC_ASSERT(kSmiTagSize == 1);
       STATIC_ASSERT(kSmiTag == 0);
-      __ Addu(v0, v0, Operand(Smi::FromInt(argc)));
+      __ Addu(scratch, scratch, Operand(Smi::FromInt(argc)));
 
       // Get the elements' length.
       __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
 
       // Check if we could survive without allocation.
-      __ Branch(&attempt_to_grow_elements, gt, v0, Operand(t0));
+      __ Branch(&attempt_to_grow_elements, gt, scratch, Operand(t0));
 
       // Check if value is a smi.
       __ lw(t0, MemOperand(sp, (argc - 1) * kPointerSize));
       __ JumpIfNotSmi(t0, &with_write_barrier);
 
       // Save new length.
-      __ sw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
 
       // Store the value.
       // We may need a register containing the address end_elements below,
       // so write back the value in end_elements.
-      __ sll(end_elements, v0, kPointerSizeLog2 - kSmiTagSize);
+      __ sll(end_elements, scratch, kPointerSizeLog2 - kSmiTagSize);
       __ Addu(end_elements, elements, end_elements);
       const int kEndElementsOffset =
           FixedArray::kHeaderSize - kHeapObjectTag - argc * kPointerSize;
       __ Addu(end_elements, end_elements, kEndElementsOffset);
       __ sw(t0, MemOperand(end_elements));
 
       // Check for a smi.
+      __ mov(v0, scratch);
       __ DropAndRet(argc + 1);
 
       __ bind(&check_double);
 
       // Check that the elements are in fast mode and writable.
       __ CheckMap(elements,
-                  a0,
+                  scratch,
                   Heap::kFixedDoubleArrayMapRootIndex,
                   &call_builtin,
                   DONT_DO_SMI_CHECK);
 
-      // Get the array's length into v0 and calculate new length.
-      __ lw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      // Get the array's length into scratch and calculate new length.
+      __ lw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
       STATIC_ASSERT(kSmiTagSize == 1);
       STATIC_ASSERT(kSmiTag == 0);
-      __ Addu(v0, v0, Operand(Smi::FromInt(argc)));
+      __ Addu(scratch, scratch, Operand(Smi::FromInt(argc)));
 
       // Get the elements' length.
       __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
 
       // Check if we could survive without allocation.
-      __ Branch(&call_builtin, gt, v0, Operand(t0));
+      __ Branch(&call_builtin, gt, scratch, Operand(t0));
 
       __ lw(t0, MemOperand(sp, (argc - 1) * kPointerSize));
       __ StoreNumberToDoubleElements(
-          t0, v0, elements, a3, t1, a2,
+          t0, scratch, elements, a3, t1, a2,
           &call_builtin, argc * kDoubleSize);
 
       // Save new length.
-      __ sw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
 
-      // Check for a smi.
+      __ mov(v0, scratch);
       __ DropAndRet(argc + 1);
 
       __ bind(&with_write_barrier);
 
       __ lw(a3, FieldMemOperand(receiver, HeapObject::kMapOffset));
 
       if (FLAG_smi_only_arrays  && !FLAG_trace_elements_transitions) {
         Label fast_object, not_fast_object;
         __ CheckFastObjectElements(a3, t3, &not_fast_object);
         __ jmp(&fast_object);
@@ skipping 29 matching lines @@
         ElementsTransitionGenerator::
             GenerateMapChangeElementsTransition(masm(),
                                                 DONT_TRACK_ALLOCATION_SITE,
                                                 NULL);
         __ bind(&fast_object);
       } else {
         __ CheckFastObjectElements(a3, a3, &call_builtin);
       }
 
       // Save new length.
-      __ sw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
 
       // Store the value.
       // We may need a register containing the address end_elements below,
       // so write back the value in end_elements.
-      __ sll(end_elements, v0, kPointerSizeLog2 - kSmiTagSize);
+      __ sll(end_elements, scratch, kPointerSizeLog2 - kSmiTagSize);
       __ Addu(end_elements, elements, end_elements);
       __ Addu(end_elements, end_elements, kEndElementsOffset);
       __ sw(t0, MemOperand(end_elements));
 
       __ RecordWrite(elements,
                      end_elements,
                      t0,
                      kRAHasNotBeenSaved,
                      kDontSaveFPRegs,
                      EMIT_REMEMBERED_SET,
                      OMIT_SMI_CHECK);
+      __ mov(v0, scratch);
       __ DropAndRet(argc + 1);
 
       __ bind(&attempt_to_grow_elements);
-      // v0: array's length + 1.
+      // scratch: array's length + 1.
       // t0: elements' length.
 
       if (!FLAG_inline_new) {
         __ Branch(&call_builtin);
       }
 
       __ lw(a2, MemOperand(sp, (argc - 1) * kPointerSize));
       // Growing elements that are SMI-only requires special handling in case
       // the new element is non-Smi. For now, delegate to the builtin.
       Label no_fast_elements_check;
       __ JumpIfSmi(a2, &no_fast_elements_check);
       __ lw(t3, FieldMemOperand(receiver, HeapObject::kMapOffset));
       __ CheckFastObjectElements(t3, t3, &call_builtin);
       __ bind(&no_fast_elements_check);
 
       ExternalReference new_space_allocation_top =
           ExternalReference::new_space_allocation_top_address(isolate());
       ExternalReference new_space_allocation_limit =
           ExternalReference::new_space_allocation_limit_address(isolate());
 
       const int kAllocationDelta = 4;
       // Load top and check if it is the end of elements.
-      __ sll(end_elements, v0, kPointerSizeLog2 - kSmiTagSize);
+      __ sll(end_elements, scratch, kPointerSizeLog2 - kSmiTagSize);
       __ Addu(end_elements, elements, end_elements);
       __ Addu(end_elements, end_elements, Operand(kEndElementsOffset));
       __ li(t3, Operand(new_space_allocation_top));
       __ lw(a3, MemOperand(t3));
       __ Branch(&call_builtin, ne, end_elements, Operand(a3));
 
       __ li(t5, Operand(new_space_allocation_limit));
       __ lw(t5, MemOperand(t5));
       __ Addu(a3, a3, Operand(kAllocationDelta * kPointerSize));
       __ Branch(&call_builtin, hi, a3, Operand(t5));
 
       // We fit and could grow elements.
       // Update new_space_allocation_top.
       __ sw(a3, MemOperand(t3));
       // Push the argument.
       __ sw(a2, MemOperand(end_elements));
       // Fill the rest with holes.
       __ LoadRoot(a3, Heap::kTheHoleValueRootIndex);
       for (int i = 1; i < kAllocationDelta; i++) {
         __ sw(a3, MemOperand(end_elements, i * kPointerSize));
       }
 
       // Update elements' and array's sizes.
-      __ sw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      __ sw(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset));
       __ Addu(t0, t0, Operand(Smi::FromInt(kAllocationDelta)));
       __ sw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
 
       // Elements are in new space, so write barrier is not required.
+      __ mov(v0, scratch);
       __ DropAndRet(argc + 1);
     }
     __ bind(&call_builtin);
     __ TailCallExternalReference(
         ExternalReference(Builtins::c_ArrayPush, isolate()), argc + 1, 1);
   }
 
-  // Handle call cache miss.
-  __ bind(&miss);
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileArrayPopCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2    : name
-  //  -- ra    : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
   // If object is not an array or is observed, bail out to regular call.
   if (!object->IsJSArray() ||
       !cell.is_null() ||
       Handle<JSArray>::cast(object)->map()->is_observed()) {
     return Handle<Code>::null();
   }
 
   Label miss, return_undefined, call_builtin;
-  Register receiver = a1;
+  Register receiver = a0;
+  Register scratch = a1;
   Register elements = a3;
-  GenerateNameCheck(name, &miss);
-
-  // Get the receiver from the stack.
-  const int argc = arguments().immediate();
-  __ lw(receiver, MemOperand(sp, argc * kPointerSize));
-  // Check that the receiver isn't a smi.
-  __ JumpIfSmi(receiver, &miss);
-
-  // Check that the maps haven't changed.
-  CheckPrototypes(
-      IC::CurrentTypeOf(object, isolate()), receiver, holder,
-      elements, t0, v0, name, &miss);
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
 
   // Get the elements array of the object.
   __ lw(elements, FieldMemOperand(receiver, JSArray::kElementsOffset));
 
   // Check that the elements are in fast mode and writable.
   __ CheckMap(elements,
-              v0,
+              scratch,
               Heap::kFixedArrayMapRootIndex,
               &call_builtin,
               DONT_DO_SMI_CHECK);
 
   // Get the array's length into t0 and calculate new length.
   __ lw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
   __ Subu(t0, t0, Operand(Smi::FromInt(1)));
   __ Branch(&return_undefined, lt, t0, Operand(zero_reg));
 
   // Get the last element.
   __ LoadRoot(t2, Heap::kTheHoleValueRootIndex);
   STATIC_ASSERT(kSmiTagSize == 1);
   STATIC_ASSERT(kSmiTag == 0);
   // We can't address the last element in one operation. Compute the more
   // expensive shift first, and use an offset later on.
   __ sll(t1, t0, kPointerSizeLog2 - kSmiTagSize);
   __ Addu(elements, elements, t1);
-  __ lw(v0, FieldMemOperand(elements, FixedArray::kHeaderSize));
-  __ Branch(&call_builtin, eq, v0, Operand(t2));
+  __ lw(scratch, FieldMemOperand(elements, FixedArray::kHeaderSize));
+  __ Branch(&call_builtin, eq, scratch, Operand(t2));
 
   // Set the array's length.
   __ sw(t0, FieldMemOperand(receiver, JSArray::kLengthOffset));
 
   // Fill with the hole.
   __ sw(t2, FieldMemOperand(elements, FixedArray::kHeaderSize));
+  const int argc = arguments().immediate();
+  __ mov(v0, scratch);
   __ DropAndRet(argc + 1);
 
   __ bind(&return_undefined);
   __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
   __ DropAndRet(argc + 1);
 
   __ bind(&call_builtin);
   __ TailCallExternalReference(
       ExternalReference(Builtins::c_ArrayPop, isolate()), argc + 1, 1);
 
-  // Handle call cache miss.
-  __ bind(&miss);
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileStringCharCodeAtCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2                     : function name
-  //  -- ra                     : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
   // If object is not a string, bail out to regular call.
   if (!object->IsString() || !cell.is_null()) return Handle<Code>::null();
 
-  const int argc = arguments().immediate();
   Label miss;
   Label name_miss;
   Label index_out_of_range;
 
   Label* index_out_of_range_label = &index_out_of_range;
 
   if (kind_ == Code::CALL_IC &&
       (CallICBase::StringStubState::decode(extra_state_) ==
        DEFAULT_STRING_STUB)) {
     index_out_of_range_label = &miss;
   }
 
-  GenerateNameCheck(name, &name_miss);
+  HandlerFrontendHeader(object, holder, name, STRING_CHECK, &name_miss);
 
-  // Check that the maps starting from the prototype haven't changed.
-  GenerateDirectLoadGlobalFunctionPrototype(masm(),
-                                            Context::STRING_FUNCTION_INDEX,
-                                            v0,
-                                            &miss);
-  ASSERT(!object.is_identical_to(holder));
-  Handle<JSObject> prototype(JSObject::cast(object->GetPrototype(isolate())));
-  CheckPrototypes(
-      IC::CurrentTypeOf(prototype, isolate()),
-      v0, holder, a1, a3, t0, name, &miss);
-
-  Register receiver = a1;
+  Register receiver = a0;
   Register index = t1;
-  Register result = v0;
+  Register result = a1;
+  const int argc = arguments().immediate();
   __ lw(receiver, MemOperand(sp, argc * kPointerSize));
   if (argc > 0) {
     __ lw(index, MemOperand(sp, (argc - 1) * kPointerSize));
   } else {
     __ LoadRoot(index, Heap::kUndefinedValueRootIndex);
   }
 
   StringCharCodeAtGenerator generator(receiver,
                                       index,
                                       result,
                                       &miss,  // When not a string.
                                       &miss,  // When not a number.
                                       index_out_of_range_label,
                                       STRING_INDEX_IS_NUMBER);
   generator.GenerateFast(masm());
+  __ mov(v0, result);
   __ DropAndRet(argc + 1);
 
   StubRuntimeCallHelper call_helper;
   generator.GenerateSlow(masm(), call_helper);
 
   if (index_out_of_range.is_linked()) {
     __ bind(&index_out_of_range);
     __ LoadRoot(v0, Heap::kNanValueRootIndex);
     __ DropAndRet(argc + 1);
   }
 
   __ bind(&miss);
   // Restore function name in a2.
   __ li(a2, name);
   __ bind(&name_miss);
   GenerateMissBranch();
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileStringCharAtCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2                     : function name
-  //  -- ra                     : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
   // If object is not a string, bail out to regular call.
   if (!object->IsString() || !cell.is_null()) return Handle<Code>::null();
 
   const int argc = arguments().immediate();
   Label miss;
   Label name_miss;
   Label index_out_of_range;
   Label* index_out_of_range_label = &index_out_of_range;
   if (kind_ == Code::CALL_IC &&
       (CallICBase::StringStubState::decode(extra_state_) ==
        DEFAULT_STRING_STUB)) {
     index_out_of_range_label = &miss;
   }
-  GenerateNameCheck(name, &name_miss);
 
-  // Check that the maps starting from the prototype haven't changed.
-  GenerateDirectLoadGlobalFunctionPrototype(masm(),
-                                            Context::STRING_FUNCTION_INDEX,
-                                            v0,
-                                            &miss);
-  ASSERT(!object.is_identical_to(holder));
-  Handle<JSObject> prototype(JSObject::cast(object->GetPrototype(isolate())));
-  CheckPrototypes(
-      IC::CurrentTypeOf(prototype, isolate()),
-      v0, holder, a1, a3, t0, name, &miss);
+  HandlerFrontendHeader(object, holder, name, STRING_CHECK, &name_miss);
 
-  Register receiver = v0;
+  Register receiver = a0;
   Register index = t1;
   Register scratch = a3;
-  Register result = v0;
-  __ lw(receiver, MemOperand(sp, argc * kPointerSize));
+  Register result = a1;
   if (argc > 0) {
     __ lw(index, MemOperand(sp, (argc - 1) * kPointerSize));
   } else {
     __ LoadRoot(index, Heap::kUndefinedValueRootIndex);
   }
 
   StringCharAtGenerator generator(receiver,
                                   index,
                                   scratch,
                                   result,
                                   &miss,  // When not a string.
                                   &miss,  // When not a number.
                                   index_out_of_range_label,
                                   STRING_INDEX_IS_NUMBER);
   generator.GenerateFast(masm());
+  __ mov(v0, result);
   __ DropAndRet(argc + 1);
 
   StubRuntimeCallHelper call_helper;
   generator.GenerateSlow(masm(), call_helper);
 
   if (index_out_of_range.is_linked()) {
     __ bind(&index_out_of_range);
     __ LoadRoot(v0, Heap::kempty_stringRootIndex);
     __ DropAndRet(argc + 1);
   }
 
   __ bind(&miss);
   // Restore function name in a2.
   __ li(a2, name);
   __ bind(&name_miss);
   GenerateMissBranch();
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileStringFromCharCodeCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2                     : function name
-  //  -- ra                     : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
   const int argc = arguments().immediate();
 
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
   if (!object->IsJSObject() || argc != 1) return Handle<Code>::null();
 
   Label miss;
-  GenerateNameCheck(name, &miss);
-
-  if (cell.is_null()) {
-    __ lw(a1, MemOperand(sp, 1 * kPointerSize));
-
-    STATIC_ASSERT(kSmiTag == 0);
-    __ JumpIfSmi(a1, &miss);
-
-    CheckPrototypes(
-        IC::CurrentTypeOf(object, isolate()),
-        a1, holder, v0, a3, t0, name, &miss);
-  } else {
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+  if (!cell.is_null()) {
     ASSERT(cell->value() == *function);
-    GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
-                                &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   // Load the char code argument.
   Register code = a1;
   __ lw(code, MemOperand(sp, 0 * kPointerSize));
 
   // Check the code is a smi.
   Label slow;
   STATIC_ASSERT(kSmiTag == 0);
   __ JumpIfNotSmi(code, &slow);
 
   // Convert the smi code to uint16.
   __ And(code, code, Operand(Smi::FromInt(0xffff)));
 
   StringCharFromCodeGenerator generator(code, v0);
   generator.GenerateFast(masm());
   __ DropAndRet(argc + 1);
 
   StubRuntimeCallHelper call_helper;
   generator.GenerateSlow(masm(), call_helper);
 
   // Tail call the full function. We do not have to patch the receiver
   // because the function makes no use of it.
   __ bind(&slow);
   ParameterCount expected(function);
   __ InvokeFunction(function, expected, arguments(),
                     JUMP_FUNCTION, NullCallWrapper(), CALL_AS_METHOD);
 
-  __ bind(&miss);
-  // a2: function name.
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileMathFloorCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2                     : function name
-  //  -- ra                     : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
-
   const int argc = arguments().immediate();
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
   if (!object->IsJSObject() || argc != 1) return Handle<Code>::null();
 
   Label miss, slow;
-  GenerateNameCheck(name, &miss);
-
-  if (cell.is_null()) {
-    __ lw(a1, MemOperand(sp, 1 * kPointerSize));
-    STATIC_ASSERT(kSmiTag == 0);
-    __ JumpIfSmi(a1, &miss);
-    CheckPrototypes(
-        IC::CurrentTypeOf(object, isolate()),
-        a1, holder, a0, a3, t0, name, &miss);
-  } else {
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+  if (!cell.is_null()) {
     ASSERT(cell->value() == *function);
-    GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
-                                &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   // Load the (only) argument into v0.
   __ lw(v0, MemOperand(sp, 0 * kPointerSize));
 
   // If the argument is a smi, just return.
   STATIC_ASSERT(kSmiTag == 0);
   __ SmiTst(v0, t0);
   __ DropAndRet(argc + 1, eq, t0, Operand(zero_reg));
@@ skipping 67 matching lines @@
   // Restore FCSR and fall to slow case.
   __ ctc1(a3, FCSR);
 
   __ bind(&slow);
   // Tail call the full function. We do not have to patch the receiver
   // because the function makes no use of it.
   ParameterCount expected(function);
   __ InvokeFunction(function, expected, arguments(),
                     JUMP_FUNCTION, NullCallWrapper(), CALL_AS_METHOD);
 
-  __ bind(&miss);
-  // a2: function name.
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileMathAbsCall(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Cell> cell,
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
-  // ----------- S t a t e -------------
-  //  -- a2                     : function name
-  //  -- ra                     : return address
-  //  -- sp[(argc - n - 1) * 4] : arg[n] (zero-based)
-  //  -- ...
-  //  -- sp[argc * 4]           : receiver
-  // -----------------------------------
-
   const int argc = arguments().immediate();
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
   if (!object->IsJSObject() || argc != 1) return Handle<Code>::null();
 
   Label miss;
 
-  GenerateNameCheck(name, &miss);
-  if (cell.is_null()) {
-    __ lw(a1, MemOperand(sp, 1 * kPointerSize));
-    STATIC_ASSERT(kSmiTag == 0);
-    __ JumpIfSmi(a1, &miss);
-    CheckPrototypes(
-        IC::CurrentTypeOf(object, isolate()),
-        a1, holder, v0, a3, t0, name, &miss);
-  } else {
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
+  if (!cell.is_null()) {
     ASSERT(cell->value() == *function);
-    GenerateGlobalReceiverCheck(Handle<JSObject>::cast(object), holder, name,
-                                &miss);
     GenerateLoadFunctionFromCell(cell, function, &miss);
   }
 
   // Load the (only) argument into v0.
   __ lw(v0, MemOperand(sp, 0 * kPointerSize));
 
   // Check if the argument is a smi.
   Label not_smi;
   STATIC_ASSERT(kSmiTag == 0);
   __ JumpIfNotSmi(v0, &not_smi);
@@ skipping 38 matching lines @@
   __ sw(a3, FieldMemOperand(v0, HeapNumber::kMantissaOffset));
   __ DropAndRet(argc + 1);
 
   // Tail call the full function. We do not have to patch the receiver
   // because the function makes no use of it.
   __ bind(&slow);
   ParameterCount expected(function);
   __ InvokeFunction(function, expected, arguments(),
                     JUMP_FUNCTION, NullCallWrapper(), CALL_AS_METHOD);
 
-  __ bind(&miss);
-  // a2: function name.
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(type, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileFastApiCall(
     const CallOptimization& optimization,
     Handle<Object> object,
     Handle<JSObject> holder,
@@ skipping 51 matching lines @@
   Label success;
   // Check that the object is a boolean.
   __ LoadRoot(at, Heap::kTrueValueRootIndex);
   __ Branch(&success, eq, object, Operand(at));
   __ LoadRoot(at, Heap::kFalseValueRootIndex);
   __ Branch(miss, ne, object, Operand(at));
   __ bind(&success);
 }
 
 
-void CallStubCompiler::CompileHandlerFrontend(Handle<Object> object,
-                                              Handle<JSObject> holder,
-                                              Handle<Name> name,
-                                              CheckType check) {
+void CallStubCompiler::PatchGlobalProxy(Handle<Object> object) {
+  if (object->IsGlobalObject()) {
+    const int argc = arguments().immediate();
+    const int receiver_offset = argc * kPointerSize;
+    __ lw(a3, FieldMemOperand(a0, GlobalObject::kGlobalReceiverOffset));
+    __ sw(a3, MemOperand(sp, receiver_offset));
+  }
+}
+
+
+Register CallStubCompiler::HandlerFrontendHeader(Handle<Object> object,
+                                                 Handle<JSObject> holder,
+                                                 Handle<Name> name,
+                                                 CheckType check,
+                                                 Label* miss) {
   // ----------- S t a t e -------------
   //  -- a2    : name
   //  -- ra    : return address
   // -----------------------------------
-  Label miss;
-  GenerateNameCheck(name, &miss);
+  GenerateNameCheck(name, miss);
+
+  Register reg = a0;
 
   // Get the receiver from the stack.
   const int argc = arguments().immediate();
-  __ lw(a1, MemOperand(sp, argc * kPointerSize));
+  const int receiver_offset = argc * kPointerSize;
+  __ lw(a0, MemOperand(sp, receiver_offset));
 
   // Check that the receiver isn't a smi.
   if (check != NUMBER_CHECK) {
-    __ JumpIfSmi(a1, &miss);
+    __ JumpIfSmi(a0, miss);
   }
 
   // Make sure that it's okay not to patch the on stack receiver
   // unless we're doing a receiver map check.
   ASSERT(!object->IsGlobalObject() || check == RECEIVER_MAP_CHECK);
   switch (check) {
     case RECEIVER_MAP_CHECK:
-      __ IncrementCounter(isolate()->counters()->call_const(), 1, a0, a3);
+      __ IncrementCounter(isolate()->counters()->call_const(), 1, a1, a3);
 
       // Check that the maps haven't changed.
-      CheckPrototypes(
+      reg = CheckPrototypes(
           IC::CurrentTypeOf(object, isolate()),
-          a1, holder, a0, a3, t0, name, &miss);
-
-      // Patch the receiver on the stack with the global proxy if
-      // necessary.
-      if (object->IsGlobalObject()) {
-        __ lw(a3, FieldMemOperand(a1, GlobalObject::kGlobalReceiverOffset));
-        __ sw(a3, MemOperand(sp, argc * kPointerSize));
-      }
+          reg, holder, a1, a3, t0, name, miss);
       break;
 
     case STRING_CHECK: {
       // Check that the object is a string.
-      __ GetObjectType(a1, a3, a3);
-      __ Branch(&miss, Ugreater_equal, a3, Operand(FIRST_NONSTRING_TYPE));
+      __ GetObjectType(reg, a3, a3);
+      __ Branch(miss, Ugreater_equal, a3, Operand(FIRST_NONSTRING_TYPE));
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
-          masm(), Context::STRING_FUNCTION_INDEX, a0, &miss);
-      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
-      CheckPrototypes(
-          IC::CurrentTypeOf(prototype, isolate()),
-          a0, holder, a3, a1, t0, name, &miss);
+          masm(), Context::STRING_FUNCTION_INDEX, a1, miss);
       break;
     }
     case SYMBOL_CHECK: {
       // Check that the object is a symbol.
-      __ GetObjectType(a1, a1, a3);
-      __ Branch(&miss, ne, a3, Operand(SYMBOL_TYPE));
+      __ GetObjectType(reg, a1, a3);
+      __ Branch(miss, ne, a3, Operand(SYMBOL_TYPE));
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
-          masm(), Context::SYMBOL_FUNCTION_INDEX, a0, &miss);
-      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
-      CheckPrototypes(
-          IC::CurrentTypeOf(prototype, isolate()),
-          a0, holder, a3, a1, t0, name, &miss);
+          masm(), Context::SYMBOL_FUNCTION_INDEX, a1, miss);
       break;
     }
     case NUMBER_CHECK: {
       Label fast;
       // Check that the object is a smi or a heap number.
-      __ JumpIfSmi(a1, &fast);
-      __ GetObjectType(a1, a0, a0);
-      __ Branch(&miss, ne, a0, Operand(HEAP_NUMBER_TYPE));
+      __ JumpIfSmi(reg, &fast);
+      __ GetObjectType(reg, a3, a3);
+      __ Branch(miss, ne, a3, Operand(HEAP_NUMBER_TYPE));
       __ bind(&fast);
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
-          masm(), Context::NUMBER_FUNCTION_INDEX, a0, &miss);
-      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
-      CheckPrototypes(
-          IC::CurrentTypeOf(prototype, isolate()),
-          a0, holder, a3, a1, t0, name, &miss);
+          masm(), Context::NUMBER_FUNCTION_INDEX, a1, miss);
       break;
     }
     case BOOLEAN_CHECK: {
-      GenerateBooleanCheck(a1, &miss);
+      GenerateBooleanCheck(reg, miss);
 
       // Check that the maps starting from the prototype haven't changed.
       GenerateDirectLoadGlobalFunctionPrototype(
-          masm(), Context::BOOLEAN_FUNCTION_INDEX, a0, &miss);
-      Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
-      CheckPrototypes(
-          IC::CurrentTypeOf(prototype, isolate()),
-          a0, holder, a3, a1, t0, name, &miss);
+          masm(), Context::BOOLEAN_FUNCTION_INDEX, a1, miss);
       break;
     }
   }
 
-  Label success;
-  __ Branch(&success);
+  if (check != RECEIVER_MAP_CHECK) {
+    Handle<Object> prototype(object->GetPrototype(isolate()), isolate());
+    reg = CheckPrototypes(
+        IC::CurrentTypeOf(prototype, isolate()),
+        a1, holder, a1, a3, t0, name, miss);
+  }
 
-  // Handle call cache miss.
-  __ bind(&miss);
-
-  GenerateMissBranch();
-
-  __ bind(&success);
+  return reg;
 }
 
 
 void CallStubCompiler::CompileHandlerBackend(Handle<JSFunction> function) {
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   ParameterCount expected(function);
   __ InvokeFunction(function, expected, arguments(),
                     JUMP_FUNCTION, NullCallWrapper(), call_kind);
 }
 
 
 Handle<Code> CallStubCompiler::CompileCallConstant(
     Handle<Object> object,
     Handle<JSObject> holder,
     Handle<Name> name,
     CheckType check,
     Handle<JSFunction> function) {
   if (HasCustomCallGenerator(function)) {
     Handle<Code> code = CompileCustomCall(object, holder,
                                           Handle<Cell>::null(),
                                           function, Handle<String>::cast(name),
                                           Code::FAST);
     // A null handle means bail out to the regular compiler code below.
     if (!code.is_null()) return code;
   }
 
-  CompileHandlerFrontend(object, holder, name, check);
+  Label miss;
+  HandlerFrontendHeader(object, holder, name, check, &miss);
+  PatchGlobalProxy(object);
   CompileHandlerBackend(function);
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(function);
 }
 
 
 Handle<Code> CallStubCompiler::CompileCallInterceptor(Handle<JSObject> object,
                                                       Handle<JSObject> holder,
                                                       Handle<Name> name) {
-  // ----------- S t a t e -------------
-  //  -- a2    : name
-  //  -- ra    : return address
-  // -----------------------------------
-
   Label miss;
 
   GenerateNameCheck(name, &miss);
 
   // Get the number of arguments.
   const int argc = arguments().immediate();
   LookupResult lookup(isolate());
   LookupPostInterceptor(holder, name, &lookup);
 
   // Get the receiver from the stack.
@@ skipping 18 matching lines @@
   return GetCode(Code::FAST, name);
 }
 
 
 Handle<Code> CallStubCompiler::CompileCallGlobal(
     Handle<JSObject> object,
     Handle<GlobalObject> holder,
     Handle<PropertyCell> cell,
     Handle<JSFunction> function,
     Handle<Name> name) {
-  // ----------- S t a t e -------------
-  //  -- a2    : name
-  //  -- ra    : return address
-  // -----------------------------------
-
   if (HasCustomCallGenerator(function)) {
     Handle<Code> code = CompileCustomCall(
         object, holder, cell, function, Handle<String>::cast(name),
         Code::NORMAL);
     // A null handle means bail out to the regular compiler code below.
     if (!code.is_null()) return code;
   }
 
   Label miss;
-  GenerateNameCheck(name, &miss);
-
-  // Get the number of arguments.
-  const int argc = arguments().immediate();
-  GenerateGlobalReceiverCheck(object, holder, name, &miss);
+  HandlerFrontendHeader(object, holder, name, RECEIVER_MAP_CHECK, &miss);
   GenerateLoadFunctionFromCell(cell, function, &miss);
-
-  // Patch the receiver on the stack with the global proxy if
-  // necessary.
-  if (object->IsGlobalObject()) {
-    __ lw(a3, FieldMemOperand(a0, GlobalObject::kGlobalReceiverOffset));
-    __ sw(a3, MemOperand(sp, argc * kPointerSize));
-  }
+  PatchGlobalProxy(object);
 
   // Set up the context (function already in r1).
   __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
   // Jump to the cached code (tail call).
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->call_global_inline(), 1, a3, t0);
   ParameterCount expected(function->shared()->formal_parameter_count());
   CallKind call_kind = CallICBase::Contextual::decode(extra_state_)
       ? CALL_AS_FUNCTION
       : CALL_AS_METHOD;
   // We call indirectly through the code field in the function to
   // allow recompilation to take effect without changing any of the
   // call sites.
   __ lw(a3, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
   __ InvokeCode(a3, expected, arguments(), JUMP_FUNCTION,
                 NullCallWrapper(), call_kind);
 
-  // Handle call cache miss.
-  __ bind(&miss);
-  __ IncrementCounter(counters->call_global_inline_miss(), 1, a1, a3);
-  GenerateMissBranch();
+  HandlerFrontendFooter(&miss);
 
   // Return the generated code.
   return GetCode(Code::NORMAL, name);
 }
 
 
 Handle<Code> StoreStubCompiler::CompileStoreCallback(
     Handle<JSObject> object,
     Handle<JSObject> holder,
     Handle<Name> name,
@@ skipping 371 matching lines @@
   // -----------------------------------
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS